What factors undermined social tolerance and democracy on the home front during WWI?

The US government put out propaganda to foster hatred and fear of the Germans.

Explanation:

Before the World War I, Germans were considered to be the largest non-English-speaking minority group in the U.S. and was the most studied modern foreign language in America

However, during World War I, it was reported that, there is an argument that if one learns German, one will become a German; a totalitarian in favor of the kaiser.

Hence, in an attempt of the US government to foster hatred and fear of the Germans, the German language was forbidden; the German-American press was heavily censored; German books were taken off the shelves; and German-American organizations were targeted, amongst many other social intolerance.

Therefore, the factors that undermined social tolerance and democracy on the home front during WWI, is that, the US government put out propaganda to foster hatred and fear of the Germans

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.